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Grain-size analysis of surficial sediments from Golfo San Jorge, Argentina

Published online by Cambridge University Press:  08 January 2004

M. Fernández ,
A. Roux ,
E. Fernández ,
J. Caló ,
A. Marcos  and
H. Aldacur
M. Fernández
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, B7602HA, Argentina
A. Roux
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Mar del Plata, B7602HA, Argentina
E. Fernández
Affiliation:
Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, 8000, Argentina
J. Caló
Affiliation:
Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, 8000, Argentina
A. Marcos
Affiliation:
Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, 8000, Argentina
H. Aldacur
Affiliation:
Departamento de Geología, Universidad Nacional del Sur, Bahía Blanca, 8000, Argentina
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Abstract

A detailed cartography of surficial sediments from Golfo San Jorge, Argentina is presented. Cluster analysis and principal components analysis (PCA) were applied considering the weight percentage of every granulometric fraction, carbonate concentration and the depth of 39 stations carried out during research cruises on board the RV ‘Captain Oca Balda’ (INIDEP).  The results defined three sectors: Sector 1, an area near the coast including Dos Bahías and Tres Puntas capes; Sector 2, a deep area far from the coast; and Sector 3, a coastal area and a south-east area between Tres Puntas cape and the inner area of the gulf. The first sector is characterized by the predominance of a coarse granulometric fraction and carbonate content. The second is defined by depth and presence of a fine granulometric fraction; while the third sector is considered a transitional sector, between the first and the second, dominated by fine sands. Sectors belong to environments of different kinds of energy or hydrodynamic conditions.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 83 , Issue 6 , December 2003 , pp. 1193 - 1197
Copyright
2003 Marine Biological Association of the United Kingdom

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